Income Taxes (Tables)

3 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate

Following is a summary of the major items comprising the differences in taxes from continuing operations computed at the federal statutory rate and as recorded in the consolidated statement of income for the three months ended March 31:

	Three Months Ended
	March 31,
(dollars in thousands)	2015			2014
Provision at statutory rate of 35%	$	10,546		$	12,513
Tax-exempt income		(3,852	)		(3,137	)
State income taxes		1,277			643
Interim period effective rate adjustment		1,506			(2,025	)
State statutory rate change		—			1,122
Other, net		(252	)		126
Income tax expense	$	9,225		$	9,242
Effective tax rate		30.6	%		25.9	%

Summary of Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

(dollars in thousands)	2015		2014
Balance at January 1,	$	77	$	3,847
Additions (reductions) based on tax positions related to the current year		11		12
Balance at March 31,	$	88	$	3,859